Full-duplex 5.1 channel PCI-Express sound card with VIA VT1723 and Envy24D multi-channel sound chip. Compliant with PCI-Express x1 specification revision 1.1 and AC'97 revision 2.3. Supports 24-bit, 48 KHz sound sampling rate for playback and recording. Features front-facing L/R, surround L/R, center/subwoofer, and S/PDIF-Out audio outputs. Optional daughter card provides rear surround L/R, line-in L/R, mono mic-in, and S/PDIF-In support. Includes noise balance cancellation function when the PC is powered on or off. System requirements: Compatible with Windows 10, Windows 7, Vista, XP, Server 2003-2008 (32/64-bit), 2000, ME, and 98SE. Requires a PC with a PCI-Express slot. Interface: PCI-E. Supported channels: 5.1 channels. Chipset: CMI8738. Audio technologies supported: Dolby Digital EX decoding, EAX 4.0, Dolby Digital AC-3 decoding, DirectSound 3D, Multi Speaker Surround 3D. Installation type: Internal. Product dimensions: 20 x 15 x 8 cm. Product weight: 0.12 kg.